Base station, terminal, and communication method

ABSTRACT

A base station that can appropriately perform feedback with regard to data transmission. A base station (100), wherein on the basis of a resource allocation configuration that was configured by a terminal (200), a DFI generation unit (106) determines a transmission method for feedback information that includes a response signal regarding uplink data. A transmission unit (110) transmits the feedback information on the basis of the transmission method.

TECHNICAL FIELD

The present disclosure relates to a base station, a terminal, and acommunication method.

BACKGROUND ART

In 3rd Generation Partnership Project (3GPP), the specification forRelease 15 New Radio access technology (NR) has been completed forrealization of 5th Generation mobile communication systems (5G). NRsupports functions for realizing Ultra Reliable and Low LatencyCommunication (URLLC) in conjunction with high speed and high capacitythat are basic requirements for enhanced Mobile Broadband (eMBB) (see,e.g., Non-Patent Literatures (hereinafter referred to as “NPLs”) 1 to4).

CITATION LIST Non-Patent Literature

NPL 1

3GPP TS 38.211 V15.3.0, “NR; Physical channels and modulation (Release15),” September 2018

NPL 2

3GPP TS 38.212 V15.3.0, “NR; Multiplexing and channel coding (Release15),” September 2018

NPL 3

3GPP TS 38.213 V15.3.0, “NR; Physical layer procedure for control(Release 15),” September 2018

NPL 4

3GPP TS 38.214 V15.3.0, “NR; Physical layer procedures for data (Release15),” September 2018

SUMMARY OF INVENTION

In NR, a feedback method for uplink data transmission has not beenexamined comprehensively.

One non-limiting and exemplary embodiment facilitates providing a basestation, a terminal, and a communication method capable of appropriatelyperforming feedback for uplink data transmission.

A base station according to an exemplary embodiment of the presentdisclosure includes: control circuitry, which, in operation, determinesa transmission method for transmitting feedback information including aresponse signal for uplink data, based on a configuration of resourceallocation configured for a terminal; and transmission circuitry, which,in operation, transmits the feedback information based on thetransmission method.

Note that these generic or specific aspects may be achieved by a system,an apparatus, a method, an integrated circuit, a computer program, or arecoding medium, and also by any combination of the system, theapparatus, the method, the integrated circuit, the computer program, andthe recoding medium.

According to an exemplary embodiment of the present disclosure, it ispossible to perform feedback for uplink data transmission appropriately.

Additional benefits and advantages of the disclosed exemplaryembodiments will become apparent from the specification and drawings.The benefits and/or advantages may be individually obtained by thevarious embodiments and features of the specification and drawings,which need not all be provided in order to obtain one or more of suchbenefits and/or advantages.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram illustrating an exemplary configuration of apart of a base station;

FIG. 2 is a block diagram illustrating an exemplary configuration of apart of a terminal;

FIG. 3 is a block diagram illustrating an exemplary configuration of thebase station;

FIG. 4 is a block diagram illustrating an exemplary configuration of theterminal;

FIG. 5 is a sequence diagram illustrating an operation example of thebase station and the terminal;

FIG. 6 illustrates an example of DFI according to Embodiment 1;

FIG. 7 illustrates an example of DFI according to Embodiment 1;

FIG. 8 illustrates an exemplary PDCCH;

FIG. 9 illustrates an exemplary PDCCH according to division method 1according to Embodiment 2;

FIG. 10 illustrates an exemplary PDCCH according to division method 2according to Embodiment 2;

FIG. 11 illustrates an exemplary PDCCH according to division method 2according to Embodiment 2;

FIG. 12 illustrates an example of DFI allocation according to Embodiment2; and

FIG. 13 illustrates an example of DFI allocation according to Embodiment2.

DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of the present disclosure will be described indetail with reference to the accompanying drawings.

Configured Grant Transmission

Release 15 NR supports “Configured grant transmission” (which isalternatively referred to as “Grant-free transmission”) for transmissionof uplink data (e.g., Physical Uplink Shared Channel (PUSCH)), as one ofthe functions for URLLC.

The Configured grant transmission for the uplink data in Release 15 NRincludes “Configured grant type 1 transmission” (which may also bereferred to simply as “Configured grant type 1” in the following) and“Configured grant type 2 transmission” (which may also be referred tosimply as “Configured grant type 2” in the following).

In Configured grant type 1, for example, Configured grant configurationinformation such as a Modulation and Coding Scheme (MCS), radio resourceallocation information (e.g., allocation of time resources or frequencyresources), transmission timing, and the number of HARQ processes isconfigured by a terminal-specific higher layer signal (e.g., RadioResource Control (RRC)). When uplink data is generated, a terminal (UserEquipment (UE)) transmits a PUSCH using a pre-configured Configuredgrant configuration information such as an MCS, radio resource, and thelike without a UL grant (in other words, dynamic scheduling informationfor uplink data) via a downlink control channel (e.g., Physical DownlinkControl Channel (PDCCH)) from a base station (for example, also calledgNB).

In Configured grant type 2, the Configured grant transmission isactivated or released by a PDCCH (e.g., Downlink Control Information(DCI)) from the base station. In Configured grant type 2, thetransmission timing, the number of HARQ processes, and the like areconfigured by the terminal-specific higher layer signal as in Configuredgrant type 1. On the other hand, in Configured grant type 2, the MCS,radio resource allocation information, and the like are configured by“Activation DCI.” When uplink data is generated, the terminal transmitsa PUSCH while semi-permanently using the Configured grant configurationinformation such as the MCS, radio resource, and the like configured bythe higher layer signal and the Activation DCI (in other words, withouta UL grant).

It is considered that Release 16 NR also supports “Configured grant type1” and “Configured grant type 2” as in Release 15 NR. In addition,functional enhancements to the Configured grant transmission in Release16 NR have been discussed.

For example, in Release 15 NR, one terminal can be configured with oneactive Configured grant transmission. In contrast, in Release 16 NR, ithas been considered that one terminal is configured with a plurality ofactive Configured grant transmissions. For example, it has beenconsidered that one terminal supports a plurality of Configured granttransmissions for each of Configured grant type 1 and Configured grantType 2, or supports a plurality of Configured grant transmissions ofConfigured grant type 1 and Configured grant Type 2.

Retransmission Control for Configured Grant Transmission

In Release 15 NR, a UL grant is used for retransmission control forConfigured grant transmission. For example, the base station controlsthe MCS and radio resource allocation information for retransmissionuplink data using the UL grant.

In Release 16 NR, as the retransmission control for Configured granttransmission, retransmission control without a UL grant in whichexplicit hybrid automatic repeat request (HARQ-ACK) information for aPUSCH is fed back has been considered in addition to the retransmissioncontrol with the UL grant that is the same as in Release 15 NR. Forexample, in Release 16 NR, for the retransmission control for Configuredgrant transmission, it has been considered that a base station transmitsfeedback information (e.g., Downlink Feedback Information (DFI))including an explicit response signal (e.g., HARQ-ACK information (ACKor NACK)) for a PUSCH.

For example, in an unlicensed band (e.g., also referred to as“NR-Unlicensed (NR-U)”), HARQ-ACK information for a plurality of piecesof uplink data (e.g., PUSCHs) is fed back to a terminal collectively.This makes it possible, for example, to reduce a load on Listen beforetalk (LBT) of the base station, to enhance efficiency of theretransmission control. Note that, in the retransmission control by theexplicit HARQ-ACK information, the MCS and the radio resource allocationof the retransmission uplink data may, for example, be the same as thoseat the time of initial transmission.

However, in NR, there is scope for further study on a transmissionmethod for transmitting the DFI including the explicit HARQ-ACKinformation.

In this respect, a description will be given of an exemplary embodimentof the present disclosure in relation to the transmission method fortransmitting the DFI including the explicit HARQ-ACK information. Forexample, an exemplary embodiment of the present disclosure will bedescribed in relation to an efficient transmission method fortransmitting the DFI including HARQ-ACK information in a case where aplurality of Configured grant transmissions are configured for oneterminal.

Overview of Communication System

A communication system according to an aspect of the present disclosureincludes base station 100 (e.g., gNB) and terminal 200 (e.g., UE).

FIG. 1 is a block diagram illustrating a configuration example of a partof base station 100 according to an aspect of the present disclosure. Inbase station 100 illustrated in FIG. 1, DFI generator 106 (correspondingto the control circuitry) determines a transmission method fortransmitting feedback information (e.g., DFI) including a responsesignal (e.g., HARQ-ACK information) for uplink data based on aconfiguration (e.g., Configured grant type or the like) of resourceallocation (e.g., Configured grant) configured for terminal 200.Transmitter 110 (corresponding to the transmission circuitry) transmitsthe feedback information based on the transmission method.

FIG. 2 is a block diagram illustrating a configuration example of a partof terminal 200 according to an aspect of the present disclosure. Interminal 200 illustrated in FIG. 2, receiver 201 (corresponding to thereception circuitry) receives, from base station 100, the feedbackinformation (e.g., DFI) including the response signal (e.g., HARQ-ACKinformation) for the uplink data. DFI analyzer 206 (corresponding to thecontrol circuitry) analyzes the feedback information (e.g., DFI) basedon the configuration of the resource allocation (e.g., Configured grant)configured for terminal 200.

Configuration of Base Station

FIG. 3 is a block diagram illustrating a configuration example of basestation 100 according to an aspect of the present disclosure. In FIG. 3,base station 100 includes receiver 101, demodulator/decoder 102,scheduler 103, transmission controller 104, control information holder105, DFI generator 106, signaling information generator 107, activationinformation generator 108, encoder/modulator 109, and transmitter 110.

Receiver 101 receives, via an antenna, a signal transmitted by terminal200, performs reception processing such as down-conversion, AIDconversion, or the like on the reception signal, and outputs thereception signal after the reception processing to demodulator/decoder102.

Demodulator/decoder 102 performs demodulation and decoding on thereception signal (e.g., uplink data) inputted from receiver 101, andoutputs control information included in the decoded signal to controlinformation holder 105. Demodulator/decoder 102 also outputs a decodingresult of the uplink data to scheduler 103 and DFI generator 106.

The decoding result of the uplink data may include, for example,information indicating success or failure of decoding for each TransportBlock (TB). In addition, when transmission on a basis of a Code BlockGroup (CBG) is enabled, the decoding result of the uplink data mayfurther include information indicating success or failure of decodingfor each CBG.

Further, the control information outputted to control information holder105 may include, for example, the data type and the data amount of thedata held by terminal 200 in a buffer.

Scheduler 103 performs scheduling for Configured grant transmission(e.g., determines the start and end of Configured grant transmission)based on, for example, the control information inputted from controlinformation holder 105. Scheduler 103 outputs scheduling informationindicating a scheduling result to transmission controller 104.

Further, scheduler 103 controls retransmission of the uplink data basedon the decoding result of the uplink data inputted fromdemodulator/decoder 102. For example, scheduler 103 instructs DFIgenerator 106 to perform DFI generation (or DFI transmission) whenretransmission control based on explicit HARQ-ACK information isperformed on the uplink data.

Transmission controller 104 configures parameters relevant to theConfigured grant transmission (e.g., an MCS, radio resource allocationinformation, and the like) based on the scheduling information inputtedfrom scheduler 103. Transmission controller 104 generates informationindicating the configuration related to the Configured granttransmission (e.g., Configured grant configuration information). Forexample, in the case of Configured grant type 1, transmission controller104 outputs the Configured grant configuration information to signalinginformation generator 107. For example, in the case of Configured granttype 2, transmission controller 104 outputs the Configured grantconfiguration information to signaling information generator 107 andactivation information generator 108. Further, transmission controller104 outputs the Configured grant configuration information to controlinformation holder 105.

Control information holder 105 holds, for example, the controlinformation from terminal 200 that is inputted from demodulator/decoder102 and the Configured grant configuration information inputted fromtransmission controller 104, and outputs the held information toscheduler 103 or DFI generator 106 as necessary.

DFI generator 106 generates DFI (e.g., a payload of the DFI) based onthe decoding result of the uplink data inputted from demodulator/decoder102 and the Configured grant configuration information inputted fromcontrol information holder 105 in accordance with an instruction fromscheduler 103. DFI generator 106 outputs the generated DFI toencoder/modulator 109. For example, the DFI may be composed ofinformation for one terminal 200 (e.g., generated for a UE specificPDCCH) or may be composed of information for a plurality of terminals200 (e.g., generated for a Group common PDCCH (GC-PDCCH).

Signaling information generator 107 generates higher-layer signalinginformation (which is alternatively referred to as RRC signaling, higherlayer parameter, or the like) used for configuration of Configured granttype 1 or Configured grant type 2 based on the Configured grantconfiguration information inputted from transmission controller 104, andoutputs the generated signaling information to encoder/modulator 109.

Based on the Configured grant configuration information inputted fromtransmission controller 104, activation information generator 108generates Activation information (e.g., information on Activation orRelease; in other words, Activation DCI) used for configuration ofConfigured grant type 2, and outputs the Activation information toencoder/modulator 109.

Encoder/modulator 109 encodes and modulates the DFI inputted from DFIgenerator 106, the signaling information inputted from signalinginformation generator 107, or the Activation information inputted fromactivation information generator 108, and outputs the modulated signal(symbol sequence) to transmitter 110.

Transmitter 110 performs transmission processing such as DIA conversion,up-conversion, amplification, or the like on the signal inputted fromencoder/modulator 109, and transmits, from the antenna to terminal 200,a radio signal obtained by the transmission processing.

Configuration of Terminal

FIG. 4 is a block diagram illustrating a configuration example ofterminal 200 according to an aspect of the present disclosure. In FIG.4, terminal 200 includes receiver 201, demodulator/decoder 202,extractor 203, signaling information analyzer 204, Activationinformation analyzer 205, DFI analyzer 206, control information holder207, transmission controller 208, transmission data generator 209,encoder/modulator 210, and transmitter 211.

Receiver 201 performs reception processing such as down-conversion, A/Dconversion, or the like on a reception signal received via an antenna,and outputs the reception signal to demodulator/decoder 202.

Demodulator/decoder 202 demodulates and decodes the reception signalinputted from receiver 201. Demodulator/decoder 202 outputs the decodedsignal to extractor 203.

Extractor 203 extracts, for example, signaling information, Activationinformation, or DFI from the signal inputted from demodulator/decoder202. Extractor 203 outputs the signaling information to signalinginformation analyzer 204, outputs the Activation information toActivation information analyzer 205, and outputs the DFI to DFI analyzer206.

Signaling information analyzer 204 analyzes the signaling informationinputted from extractor 203, and outputs Configured grant configurationinformation for Configured grant type 1 or Configured grant type 2 tocontrol information holder 207.

Activation information analyzer 205 analyzes the Activation informationinputted from extractor 203, and outputs the Activation information (forexample, Configured grant configuration information for Configured granttype 2) to control information holder 207.

Based on the Configured grant configuration information inputted fromcontrol information holder 207, DFI analyzer 206 analyzes the DFIinputted from extractor 203, and outputs the obtained HARQ-ACKinformation to transmission controller 208.

Control information holder 207 holds the Configured grant configurationinformation inputted from signaling information analyzer 204 orActivation information analyzer 205, and outputs the held Configuredgrant configuration information to DFI analyzer 206, transmissioncontroller 208, or transmission data generator 209 as necessary.

Based on the Configured grant configuration information inputted fromcontrol information holder 207 and the HARQ-ACK information inputtedfrom DFI analyzer 206, transmission controller 208 judges whether or notto perform Configured grant transmission. When the Configured granttransmission is performed, transmission controller 208 instructstransmission data generator 209 to perform the Configured granttransmission.

In accordance with the instruction of transmission controller 208,transmission data generator 209 generates transmission data (e.g.,PUSCH) based on the Configured grant configuration information inputtedfrom control information holder 207, and outputs the transmission data(e.g., PUSCH) to encoder/modulator 210. For example, the transmissiondata may include control information for terminal 200 (the data type,the data amount, or the like of data held in the buffer of terminal200).

Encoder/modulator 210 encodes and modulates the transmission datainputted from transmission data generator 209, and outputs the modulatedsignal to transmitter 211.

Transmitter 211 performs transmission processing such as D/A conversion,up-conversion, amplification, or the like on the signal inputted fromencoder/modulator 210, and transmits, from the antenna to base station100, a radio signal obtained by the transmission processing.

Operation of Base Station 100 and Terminal 200

An operation example in base station 100 and terminal 200 having theabove configurations will be described.

FIG. 5 is a sequence diagram illustrating an operation of base station100 and terminal 200.

For example, base station 100 generates Configured grant configurationinformation based on scheduling information for terminal 200 (ST101).Base station 100 notifies terminal 200 of the Configured grantconfiguration information (ST102). The Configured grant configurationinformation (e.g., including signaling information or Activationinformation) is notified to terminal 200 by a higher layer signal andActivation DCI, for example, according to a Configured grant type.Terminal 200 obtains the Configured grant configuration informationnotified from base station 100 (ST103).

For example, when uplink data is generated, terminal 200 transmits theuplink data based on the Configured grant configuration information(ST104).

Base station 100 generates HARQ-ACK information (e.g., ACK or NACK) forthe uplink data (ST105), and transmits (in other words, feeds back) DFIincluding the generated HARQ-ACK information to terminal 200 (ST106).Note that, base station 100 determines a transmission method fortransmitting the DFI (in other words, HARQ-ACK information) based onConfigured grant configuration (e.g., Configured grant type or the like)for terminal 200.

Terminal 200 performs retransmission control for the uplink data basedon the HARQ-ACK information included in the received DFI (ST107).

TB Size and Number of CBGs

As described above, in NR, retransmission control per CBG are definedfor uplink data (e.g., PUSCH).

The CBG is composed of a group of one or more Code Blocks (CBs), and atransport block (TB) is composed of one or more CBGs. The maximum numberof CBGs per TB is configured, for example, by base station 100 forterminal 200 by the higher layer signaling. In terminal 200, CBs areformed into a group such that the number of groups should not exceed theconfigured maximum number of CBGs. By feeding back HARQ-ACK informationfor uplink data for each CBG of the uplink data, base station 100 allowsretransmission by terminal 200 per CBG.

Further, a calculation method for calculating the number of CBs used forencoding a PUSCH in NR is defined in, for example, NPL 2. For example,NPL 2 discloses a calculation method for calculating the number of CBsin Low density Parity Check (LDPC) coding.

According to NPL 2, when the number of CBs is less than the maximumnumber of CBGs, the number of CBGs used may be less than the maximumnumber of CBGs. For example, when the TB size is 5,000 bits and LDPCbase graph 2 is used in the LDPC coding (e.g., maximum CB size =3,840bits), the number of CBs per TB is 2. At this time, for example, evenwhen the maximum number of CBGs is configured to 4, the number of CBGsused by terminal 200 is configured to 2 since the number of existing CBsis 2.

As is understood, the number of CBGs used by terminal 200 variesaccording to the TB size in the PUSCH. Accordingly, in the case ofretransmission control for each CBG, the size of HARQ-ACK informationfor the PUSCH (e.g., the number of bits) varies according to the TB sizein the PUSCH.

In addition, in Configured grant transmission, the variation in the TBsize in the PUSCH (in other words, the configuration occasion) differsdepending on, for example, the Configured grant type (e.g., Configuredgrant type 1 or Configured grant type 2). For example, the TB size isconfigured semi-statically in Configured grant type 1, whereas it isconfigured dynamically in Configured grant type 2.

Taking this into consideration, in the present embodiment, base station100 (e.g., DFI generator 106) calculates the size (e.g., the number ofbits) of HARQ-ACK information included in DFI depending on theConfigured grant type.

DFI Information Generation Method

Hereinafter, an exemplary method for DFI generator 106 of base station100 to generate HARQ-ACK information included in DFI will be described.

The DFI (e.g., DFI bit sequence) includes, for example, a HARQ-ACK bitsequence, and a bit sequence of other control information (e.g., TPCcommand, precoding information, or the like).

When base station 100 transmits the DFI using a control channel forspecific terminal 200 (e.g., UE specific PDCCH), base station 100transmits a DFI bit sequence for one terminal 200 (e.g., UE #0) usingthe PDCCH, for example, as illustrated in FIG. 6.

On the other hand, when base station 100 transmits the DFI using acontrol channel for a plurality of terminals 200 (e.g., GC-PDCCH), basestation 100 transmits, using the PDCCH, a bit sequence in whichrespective DFI bit sequences for the plurality of terminals 200 (e.g.,UE #0 and UE #1) are arranged, for example, as illustrated in FIG. 7. Inthe GC-PDCCH, for example, the starting positions (starting bitpositions) at which the DFI bit sequences addressed to respectiveterminals 200 are arranged and the sizes (e.g., the numbers of bits) ofthe DFI are notified to terminals 200 in advance by Configured grantconfiguration information, or are determined by terminals 200 based onthe notified information.

Further, the HARQ-ACK bit sequence may be, for example, in a bitmapformat in which HARQ-ACK bits for each HARQ process that are used forConfigured grant transmission are arranged in order.

Here, when the retransmission control per CBG is not enabled (forexample, when HARQ-ACK per TB is transmitted), base station 100generates a HARQ-ACK bit sequence in which the number of HARQ-ACK bitsper one HARQ process (for example, one TB) is one bit. For example, whentwo processes are used for Configured grant type 1, when four processesare used for Configured grant type 2, and when these HARQ processesdiffer from one another, base station 100 generates a HARQ-ACK bitsequence of 6 bits.

On the other hand, when the retransmission control per CBG is enabled(for example, when HARQ-ACK per CBG is transmitted), base station 100calculates the number of HARQ-ACK bits per TB as follows based on the“Configured grant type” configured for terminal 200.

For example, when the Configured grant type is Configured grant type 1,base station 100 calculates the number of HARQ-ACK bits per TB based onthe TB size of the PUSCH. For example, base station 100 configures thenumber of HARQ-ACK bits per TB to the same value as the number of CBGsdetermined based on the number of CBs calculated from the TB size. Forexample, when the maximum number of CBGs is 4 and when the number of CBsdetermined from the TB size is 2, the number of CBGs used by terminal200 is configured to 2. Thus, base station 100 configures the number ofHARQ-ACK bits per TB to 2 bits that is the same number as the number ofCBGs (in other words, the number of CBs).

In Configured grant type 1, the MCS and frequency resource allocationare semi-statically determined by the higher layer signaling. This meansthat in Configured grant type 1, the TB size is configuredsemi-statically. Accordingly, in Configured grant type 1, the number ofCBGs actually used by terminal 200 is also configured semi-statically.Thus, in Configured grant type 1, when the number of CBs is less thanthe maximum number of CBGs, the number of HARQ-ACK bits equal to thenumber of CBs only needs to be secured instead of securing the number ofHARQ-ACK bits equal to the maximum number of CBGs.

On the other hand, when the Configured grant type is Configured granttype 2, base station 100 calculates the number of HARQ-ACK bits per TBbased on the maximum number of CBGs to be configured. For example, basestation 100 configures the number of HARQ-ACK bits per TB to the samevalue as the maximum number of CBGs. For example, when the maximumnumber of CBGs is 4, base station 100 configures the number of HARQ-ACKbits per TB to 4 bits that is the same number as the maximum number ofCBGs.

In Configured grant type 2, the MCS and frequency resource allocationmay be dynamically changed by Activation or Reactivation by the PDCCH.This means that in Configured grant type 2, the TB size can changedynamically. Accordingly, in Configured grant type 2, the number of CBGsactually used by terminal 200 may also change dynamically, and thenumber of HARQ-ACK bits corresponding to the number of CBGs may alsochange dynamically. Thus, in Configured grant type 2, HARQ-ACK bitsequal in number to the maximum number of CBGs are secured.

Note that, when a HARQ process is shared between Configured grant type 1and Configured grant type 2, base station 100 may configure the numberof HARQ-ACK bits per TB to the same value as the maximum number of CBGs.This is because it is probable that in Configured grant type 2, HARQ-ACKequal in number to the maximum number of CBGs is transmitted, and it isthus necessary to secure HARQ-ACK bits equal in number to the maximumnumber of CBGs.

In addition, DFI analyzer 206 of terminal 200 analyzes the DFI based onthe same method as the aforementioned DFI generation method for basestation 100 to generate the DFI including HARQ-ACK information describedabove.

As described above, in the present embodiment, base station 100determines the transmission method for transmitting the DFI includingHARQ-ACK information for the uplink data based on the configuration (forexample, Configured grant type) of resource allocation (for example,Configured grant) configured for terminal 200, and transmits the DFIbased on the determined transmission method. Further, terminal 200receives the DFI from base station 100, and analyzes the DFI based onthe Configured grant configuration for terminal 200.

For example, according to a Configured grant type and HARQ processassignment, base station 100 and terminal 200 determine the number ofbits to be used for transmission of HARQ-ACK information per TB. Thus,the number of bits used for transmission of HARQ-ACK information isconfigured appropriately according to the Configured grant type.According to the present embodiment, it is possible, for example, toreduce the number of HARQ-ACK bits used as compared with the case wherenumber of HARQ-ACK bits equal to the maximum number of CBGs isconstantly secured.

Accordingly, according to the present embodiment, base station 100 iscapable of performing appropriate feedback for the transmission ofuplink data by terminal 200.

Note that, the present embodiment is also applicable to a case where thenumber of HARQ-ACK bits per one TB is configured independently of themaximum number of CBGs. For example, when the number of HARQ-ACK bitsper TB in Configured grant type 2 is configured to the normal number ofbits and the number of HARQ-ACK bits per TB in Configured grant type 1is configured to the number of bits calculated from the TB size, thepresent embodiment is also applicable to a case where the number ofHARQ-ACK bits per TB in Configured grant type 2 is greater than thenumber of HARQ-ACK bits per TB in

Configured grant type 1, or a case where the number of HARQ-ACK bits perTB in Configured grant type 2 is greater than or equal to the number ofHARQ-ACK bits per TB of Configured grant type 1.

In addition, in the present embodiment, the number of HARQ-ACK bits perTB in Configured grant type 2 is not limited to the maximum number ofCBGs, and may be selected from a plurality of candidate values (e.g., 2,4, 6, and 8).

Embodiment 2

In Configured grant type 2, a terminal does not transmit a PUSCH whenConfigured grant transmission is not enabled by Activation notificationby a PDCCH. When the terminal does not transmit a PUSCH, HARQ-ACKinformation is not required. However, when resources are semi-staticallyallocated by the higher layer signaling or the like, it is supposed thatresources for HARQ-ACK information (e.g., bits) are left secured evenwhen the HARQ-ACK information is not required.

By way of example, as illustrated in FIG. 8, the allocation of DFI bitsin which 3 HARQ-ACK bits are secured for each of Configured grant type 1and Configured grant type 2 will be described. In FIG. 8, whenConfigured grant type 2 is not Activated, 3 bits corresponding toHARQ-ACK information for Configured grant type 2 are not used but aresecured.

As is understood, when Configured grant type 2 is configured for aterminal, resources that are secured for HARQ-ACK information but arenot used may occur.

Further, the resources that are secured but are not used are not limitedto resources in the case where Configured grant types 1 and 2 are mixedas illustrated in FIG. 8. For example, the same happens when Configuredgrant type 1 is not configured and Configured grant type 2 is configured(e.g., one or more Configured grant types 2 are configured by the higherlayer signaling) (not illustrated).

In this respect, the present embodiment will be described in relation toa method for reducing ineffective resources that are not used for theabove-described HARQ-ACK information.

Since the base station and the terminal according to the presentembodiment have the same basic configurations as base station 100 andterminal 200 according to Embodiment 1, they will be described withreference to FIGS. 3 and 4.

For example, control regarding DFI transmission in base station 100(e.g., DFI generator 106) and terminal 200 (e.g., DFI analyzer 206) willbe described. Hereinafter, division method 1 and division method 2 forDFI will be described.

Division Method 1

In division method 1, base station 100 divides DFI by using differentidentifiers (e.g., Radio Network Temporary Identifiers (RNTIs))depending on a Configured grant type and configuration (Configured grantconfiguration) relevant to Configured grant transmission.

When determining the Configured grant configuration, base station 100configures an RNTI and a DFI-bit allocation starting position in a PDCCHthat are different for each Configured grant configuration.

For example, as illustrated in FIG. 9, base station 100 allocates theDFIs corresponding respectively to Configured grant type 1 andConfigured grant type 2 to PDCCHs different between the Configured granttypes. For example, in FIG. 9, for Configured grant type 1, base station100 transmits a PDCCH including Cyclic Redundancy Check (CRC) scrambledwith an RNTI for Configured grant type 1. Further, in FIG. 9, forConfigured grant type 2, base station 100 transmits a PDCCH includingCRC scrambled with an RNTI for Configured grant type 2.

In other words, base station 100 transmits the DFI (feedbackinformation) using a different PDCCH (in other words, controlinformation) for each Configured grant configuration (e.g., Configuredgrant type). Further, each of the PDCCHs is scrambled with a differentidentifier (here, RNTI) for each Configured grant configuration.

In the example illustrated in FIG. 9, for example, when Configured granttype 2 is not Activated, terminal 200 may not receive the PDCCH usingthe RNTI for Configured grant type 2. Thus, when Configured grant type 2is not Activated and when no other bits of the PDCCH for Configuredgrant type 2 are being used for other terminals 200, base station 100 iscapable of stopping transmission of the PDCCH for Configured grant type2. Further, even when other bits of the PDCCH for Configured grant type2 are used for other terminals 200, base station 100 may use free bits(3 bits in FIG. 9) which are not used for Configured grant type 2, forallocation of information addressed to other terminals 200. With thisconfiguration, it is possible to improve the use efficiency of PDCCHresources.

Note that the above example has been described by taking the GC-PDCCH asan example. By using the GC-PDCCH, base station 100 is capable ofcollectively transmitting the DFI for a plurality of terminals 200, forexample. However, the PDCCH for the DFI transmission is not limited tothe GC-PDCCH, and a UE specific PDCCH may be used. The UE specific PDCCHalso offers the same effects as the GC-PDCCH. Further, in the case ofthe UE specific PDCCH, resources (e.g., PDCCH bits) to which the DFI foreach terminal 200 is allocated are not shared with other terminals 200.Thus, for example, base station 100 is capable of stopping PDCCHtransmission when Configured grant type 2 is not Activated.

Further, the present disclosure is not limited to the case whereConfigured grant type 1 and Configured grant type 2 are mixed. Forexample, also when Configured grant type 1 is not configured andConfigured grant type 2 is configured (e.g., multiple Configured granttypes 2 are configured by the higher layer signaling), base station 100may assign a different RNTI for each Configured grant configuration.Thus, base station 100 transmits the PDCCH corresponding to ActivatedConfigured grant type 2 and stops the PDCCH transmission correspondingto non Activated Configured grant type 2. In addition, terminal 200 iscapable of receiving the PDCCH corresponding to an Activated Configuredgrant among the Configured grants configured.

Further, the present disclosure is not limited to the case where oneRNTI is associated with one Configured grant configuration. For example,one RNTI may be associated with a plurality of Configured grantconfigurations. By associating a plurality of Configured grantconfigurations with one RNTI, it is possible to reduce the number ofRNTIs to be used, so as to reduce erroneous detection (False alarm rate(FAR)) of PDCCH. Further, when a HARQ process is shared among aplurality of Configured grant configurations, base station 100 does notneed to redundantly transmit HARQ-ACKs corresponding to the respectiveConfigured grant configurations, and it is thus possible to improve theuse efficiency of PDCCH resources. Further, base station 100 does notneed to redundantly transmit control information (e.g., TPC command)that is not associated with the Configured grant configurations, and itis thus possible to improve the use efficiency of PDCCH resources.

As is understood, in division method 1, base station 100 divides the DFIusing different RNTIs according to the Configured grant type andConfigured grant configuration.

Division Method 2

In division method 2, base station 100 provides an identification bit(in other words, identifier field) for DFI, and associates theidentification bit with a different value depending on the Configuredgrant type and Configured grant configuration to divide different DFIs.

When determining the Configured grant configuration, base station 100configures a identification bit and a DFI-bit allocation startingposition in a PDCCH that are different for each Configured grantconfiguration.

For example, base station 100 allocates the DFI to a PDCCH different foreach Configured grant configuration. For example, in the exampleillustrated in FIG. 10, base station 100 allocates the DFIscorresponding to Configured grant #0 and Configured grant #1 todifferent PDCCHs. Each of the PDCCHs illustrated in FIG. 10 are providedwith the identification bits (Bit #2). In the example illustrated inFIG. 10, the identification bit=0 is associated with Configured grant#0, and the identification bit=1 is associated with Configured grant #1.

In other words, base station 100 transmits the DFI (feedbackinformation) using a different PDCCH (in other words, controlinformation) for each Configured grant configuration (e.g., Configuredgrant type). Further, each of the PDCCHs includes information (here,identification bit) indicating the Configured grant configuration.

For example, when terminal 200 accepts a plurality of receptions ofPDCCHs of the same RNTI, terminal 200 is capable of simultaneouslyreceiving the DFI allocated to these different PDCCHs.

Further, in the example illustrated in FIG. 10, for example, whenConfigured grant #0 is not Activated, terminal 200 does not have toreceive the PDCCH corresponding to Configured grant #0 (in other words,PDCCH including the DFI with the identification bit having a value of0). Thus, base station 100 may stop transmission of the PDCCHcorresponding to Configured grant #0 as in division method 1.Alternatively, base station 100 may use free bits (3 bits in FIG. 10)which are not used for Configured grant #0, for allocation ofinformation addressed to other terminals 200. With this configuration,it is possible to improve the use efficiency of PDCCH resources.

In addition, as in division method 1, the PDCCH for the DFI transmissionis not limited to the GC-PDCCH, and a UE specific PDCCH may be used. Inaddition, as in division method 1, Configured grant type 1 andConfigured grant type 2 may be mixed, or Configured grant #1 may not beconfigured while a plurality of Configured grant types 2 may beconfigured.

Further, the present disclosure is not limited to the case where one DFI(in other words, identification bit) is associated with one Configuredgrant configuration. For example, one DFI may be associated with aplurality of Configured grant configurations. By associating one DFIwith a plurality of Configured grant configurations, it is possible toreduce the overhead of identification bits. Further, when a HARQ processis shared among a plurality of Configured grant configurations, basestation 100 does not need to redundantly transmit HARQ-ACKscorresponding to the respective Configured grant configurations, and itis thus possible to improve the use efficiency of PDCCH resources.Further, base station 100 does not need to redundantly transmit controlinformation (e.g., TPC command) that is not associated with theConfigured grant configurations, and it is thus possible to improve theuse efficiency of PDCCH resources.

Further, in division method 2, base station 100 may allocate the DFIscorresponding to a plurality of Configured grant configurations to onePDCCH, for example, as illustrated in FIG. 11. In this case, basestation 100 does not have to transmit a plurality of PDCCHs whensimultaneously transmitting a plurality of DFIs to terminal 200, and itis thus possible to reduce resources used for the PDCCHs. In addition,base station 100 can use bits, for example, for allocation ofinformation addressed to other terminals 200 at bit positionscorresponding to a non-Activated Configured grant, and it is thuspossible to improve the use efficiency of PDCCH resources.

As described above, in division method 2, base station 100 provides theidentification bit for DFI and associates the identification bit with adifferent value depending on the Configured grant type and Configuredgrant configuration to divide the DFI.

Here, when the number of RNTIs monitored by terminal 200 increases, theprobability of erroneous detection of PDCCH increases due to anaccidental CRC result of OK. On the other hand, in division method 2,the number of RNTIs monitored by terminal 200 does not increase with thenumber of Configured grants, and it is thus advantageous that theerroneous detection rate (False alarm rate (FAR)) of PDCCH does notincrease. In other words, division method 2 can reduce the FAR of PDCCHas compared with division method 1.

Division method 1 and division method 2 for DFI have been describedabove.

As described above, in division method 1 and division method 2, forexample, when transmitting HARQ-ACK information, base station 100allocates a DFI bit to a PDCCH corresponding to a correspondingConfigured grant configuration. On the other hand, when not transmittingHARQ-ACK information (for example, when Configured grant type 2 is notActivated), base station 100 does not transmit a PDCCH corresponding toa corresponding Configured grant configuration. With this configuration,it is possible to improve the use efficiency of PDCCH resources. Inother words, it is possible to reduce resources which are unnecessarilysecured without being used for HARQ-ACK information.

Dynamic Change of DFI Bit Allocation

For example, base station 100 configures DFI-bit allocation of eachterminal 200 semi-statically. For example, base station 100semi-statically configures allocation starting positions of respectiveDFIs of terminals 200 and RNTIs (when necessary) using the higher layersignaling.

Further, for example, base station 100 may dynamically configure theDFI-bit allocation for each terminal 200. For example, base station 100configures terminal 200 with a plurality of candidates for the DFIallocation starting position and RNTI (when necessary) using the higherlayer signaling. Using a PDCCH for Activation/Release of a Configuredgrant, base station 100 notifies terminal 200 of information (e.g., anindex value) indicating one of the plurality of candidates configuredfor terminal 200. This allows dynamic allocation of DFI bits whilereducing the number of bits used in the PDCCH.

FIG. 12 illustrates exemplary DFI-bit allocation.

In FIG. 12, for example, the DFI allocation starting positions (staringpositions in a PDCCH) and the RNTIs are associated respectively with theindex values (0 to 3). Information on these associations is notifiedfrom base station 100 to terminal 200, for example, using higher layersignaling. By using the PDCCH, base station 100 notifies terminal 200 ofan index value corresponding to an allocation starting position and anRNTI (when necessary) actually used for DFI-bit allocation. Terminal 200identifies the DFI-bit allocation starting position and RNTI based onthe index value notified from base station 100.

For example, in the example of FIG. 12, a 2-bit field may be provided inthe PDCCH for the DFI-bit allocation.

FIG. 13 illustrates another exemplary DFI-bit allocation.

In FIG. 13, for example, both of DFI-bit allocation starting positionsand RNTIs are associated respectively with separate index values. InFIG. 13, base station 100 is capable of separately control theallocation starting position and the RNTI, and is thus capable ofallocating the DFI bit more flexibly.

For example, in the example of FIG. 13, a 3-bit field (2 bits for theallocation starting position and 1 bit for RNTI) may be provided in thePDCCH for DFI-bit allocation.

Note that, when there are enough PDCCH bits, base station 100 maydirectly notify terminal 200 of the DFI-bit allocation starting position(or RNTI) using the PDCCH without configuring DFI-bit allocationcandidates by the higher layer signaling.

In addition, the notification of the allocation starting position doesnot have to be in units of a bit. For example, the allocation startingposition may be notified in units of a group of a specific number ofbits formed by dividing a plurality of bits (may e.g., notified by agroup number).

Further, in Configured grant type 2, whether or not terminal 200 needsDFI is dynamically changed depending on Activation and Release. In thisrespect, as described above, by dynamically allocating DFI bits, basestation 100 is capable of dynamically allocating DFI to free resources,thereby improving the use efficiency of PDCCH resources.

Note that, the dynamic allocation of DFI bits described above is notlimited to the DFI, and the dynamic allocation may be applied to otherGC-PDCCHs with bit allocation specific to a terminal or to a terminalgroup. The other GC-PDCCHs may, for example, include a TPC command(notified by DCI format 2_2 or 2_3), a Slot Format Indicator (SFI)(notified by DCI format 2_0), and the like. Also in this case, as withthe DFI-bit allocation, base station 100 notifies terminal 200 ofcandidates for the allocation starting position by the higher layersignaling, and notifies a candidate index for use in implementationusing a PDCCH.

Further, in this case, regarding PDCCHs, a PDCCH for dynamicconfiguration that differs from the PDCCH for Activation or Release ofthe Configured grant may be separately defined in order to enable thedynamic configuration independent of the Configured grant. In the PDCCHfor dynamic configuration as in the PDCCH for Activation/Release of theConfigured grant, a particular field is configured with a value of aparticular pattern. At this time, in the PDCCH for dynamicconfiguration, for example, a value of a pattern different from that ofthe PDCCH for Activation/Release of the Configured grant, or a RNTI tobe used is used. Thus, terminal 200 is capable of distinguishing thePDCCH for the dynamic configuration. Note that, when there are enoughPDCCH bits, base station 100 may directly notify terminal 200 of theallocation starting position using the PDCCH without configuring thecandidates by the higher layer signaling. Thus, by dynamicallyconfiguring the allocation starting position in the GC-PDCCH with thebit allocation specific to a terminal or to a terminal group, basestation 100 is capable of dynamically allocating the GC-PDCCH to freeresources, thereby improving the use efficiency of PDCCH resources.

Note that, target information for dynamic allocation is not limited tothe above-described TPC command and SFI, and may be other information(e.g., UE-specific configuration information or the like).

Embodiment 3

The present embodiment will be described in relation to an operation inwhich Configured grant type 2 is not Activated as in Embodiment 2.

Since the base station and the terminal according to the presentembodiment have the same basic configurations as base station 100 andterminal 200 according to Embodiment 1, they will be described withreference to FIGS. 3 and 4.

DFI Substitution Method

An exemplary DFI substitution method for base station 100 (e.g., DFIgenerator 106) will be described. Note that, terminal 200 (e.g., DFIanalyzer 206) also performs DFI analysis based on a DFI substitutionmethod similar to that of base station 100.

Base station 100 substitutes bits assigned for the DFI for Configuredgrant type 2 with other control information, for example, whenConfigured grant type 2 is not Activated.

For example, base station 100 may substitute the DFI with precodinginformation, TPC command, or the like of another Configured grant. Thisallows base station 100 to transmit feedback information so that atransmission method according to the current communication state orpropagation path is configured for terminal 200, so as to improve thereception quality of base station 100.

Alternatively, base station 100 may substitute the DFI with a SRSrequest, a CSI request, or the like. This allows base station 100 totrigger terminal 200 to transmit a signal or information for graspingthe current communication state.

As described above, according to the present embodiment, base station100 transmits other control information by utilizing the bits allocatedfor the DFI that are not used in the non-Activated case. It is thuspossible to achieve improvement in the reception quality of base station100 without an increase in the number of bits of the PDCCH, so as toimprove the use efficiency of PDCCH resources.

Note that, the information substituting the DFI is not limited to theprecoding information, TPC command, SRS request, and CSI request, andmay be other information.

Exemplary embodiments of the present disclosure have been describedabove.

Other Embodiment

Note that, the number of CBGs may be configured by the higher layersignaling (e.g., RRC signaling or MAC signaling) or may bepre-configured according to specifications.

The above embodiments may be applied to a case where base station 100collectively transmits HARQ-ACKs of a plurality of Component Carriers(CCs) to terminal 200 at the time of Carrier Aggregation (CA), forexample. When HARQ-ACKs of the plurality of CCs are transmittedcollectively, more PDCCH resources are required, and accordingly,application of the present embodiments can improve the use efficiency ofPDCCH resources.

The present disclosure can be realized by software, hardware, orsoftware in cooperation with hardware. Each functional block used in thedescription of each embodiment described above can be partly or entirelyrealized by an LSI such as an integrated circuit, and each processdescribed in the each embodiment may be controlled partly or entirely bythe same LSI or a combination of LSIs. The LSI may be individuallyformed as chips, or one chip may be formed so as to include a part orall of the functional blocks. The LSI may include a data input andoutput coupled thereto. The LSI herein may be referred to as an IC, asystem LSI, a super LSI, or an ultra LSI depending on a difference inthe degree of integration. However, the technique of implementing anintegrated circuit is not limited to the LSI and may be realized byusing a dedicated circuit, a general-purpose processor, or aspecial-purpose processor. In addition, a FPGA (Field Programmable GateArray) that can be programmed after the manufacture of the LSI or areconfigurable processor in which the connections and the settings ofcircuit cells disposed inside the LSI can be reconfigured may be used.The present disclosure can be realized as digital processing or analogueprocessing. If future integrated circuit technology replaces LSIs as aresult of the advancement of semiconductor technology or otherderivative technology, the functional blocks could be integrated usingthe future integrated circuit technology. Biotechnology can also beapplied.

The present disclosure can be realized by any kind of apparatus, deviceor system having a function of communication, which is referred to as acommunication apparatus. Some non-limiting examples of such acommunication apparatus include a phone (e.g., cellular (cell) phone,smart phone), a tablet, a personal computer (PC) (e.g., laptop, desktop,netbook), a camera (e.g., digital still/video camera), a digital player(digital audio/video player), a wearable device (e.g., wearable camera,smart watch, tracking device), a game console, a digital book reader, atelehealth/telemedicine (remote health and medicine) device, and avehicle providing communication functionality (e.g., automotive,airplane, ship), and various combinations thereof.

The communication apparatus is not limited to be portable or movable,and may also include any kind of apparatus, device or system beingnon-portable or stationary, such as a smart home device (e.g., anappliance, lighting, smart meter, control panel), a vending machine, andany other “things” in a network of an “Internet of Things (IoT)”.

The communication may include exchanging data through, for example, acellular system, a wireless LAN system, a satellite system, etc., andvarious combinations thereof.

The communication apparatus may comprise a device such as a controlleror a sensor which is coupled to a communication device performing afunction of communication described in the present disclosure. Forexample, the communication apparatus may comprise a controller or asensor that generates control signals or data signals which are used bya communication device performing a communication function of thecommunication apparatus.

The communication apparatus also may include an infrastructure facility,such as a base station, an access point, and any other apparatus, deviceor system that communicates with or controls apparatuses such as thosein the above non-limiting examples.

A base station according to an exemplary embodiment of the presentdisclosure includes: control circuitry, which, in operation, determinesa transmission method for transmitting feedback information including aresponse signal for uplink data, based on a configuration of resourceallocation configured for a terminal; and transmission circuitry, which,in operation, transmits the feedback information based on thetransmission method.

In the base station according to an exemplary embodiment of the presentdisclosure, the configuration includes a type of the resourceallocation, and the control circuitry determines, based on the type, anumber of bits used for transmission of the response signal.

In the base station according to an exemplary embodiment of the presentdisclosure, the control circuitry determines the number of bits based ona transport block size of the uplink data when the type is a first type,and determines the number of bits based on a maximum number of codeblock groups constituting the transport block when the type is a secondtype different from the first type.

In the base station according to an embodiment of the presentdisclosure, the transmission circuitry transmits the feedbackinformation using control information different for each of a pluralityof the configurations.

In the base station according to an exemplary embodiment of the presentdisclosure, the control information is scrambled with an identifierdifferent for each of the configurations.

In the base station according to an exemplary embodiment of the presentdisclosure, the control information includes information indicating theconfiguration.

A terminal according to an exemplary embodiment of the presentdisclosure includes: reception circuitry, which, in operation, receivesfeedback information from a base station, the feedback informationincluding a response signal for uplink data; and control circuitry,which, in operation, analyzes the feedback information based on aconfiguration of a resource allocation configured.

A communication method according to an exemplary embodiment of thepresent disclosure includes: determining a transmission method fortransmitting feedback information including a response signal for uplinkdata, based on a configuration of resource allocation configured for aterminal; and transmitting the feedback information based on thetransmission method.

A communication method according to an exemplary embodiment of thepresent disclosure includes: receiving feedback information from a basestation, the feedback information including a response signal for uplinkdata; and analyzing the feedback information based on a configuration ofa resource allocation configured.

The disclosure of Japanese Patent Application No. 2019-001857 dated Jan.9, 2019 including the specification, drawings and abstract isincorporated herein by reference in its entirety.

INDUSTRIAL APPLICABILITY

An exemplary embodiment of the present disclosure is useful for mobilecommunication systems.

REFERENCE SIGNS LIST

100 Base station

101, 201 Receiver

102, 202 Demodulator/decoder

103 Scheduler

104, 208 Transmission controller

105, 207 Control information holder

106 DFI generator

107 Signaling information generator

108 Activation information generator

109, 210 Encoder/modulator

110, 211 Transmitter

200 Terminal

203 Extractor

204 Signaling information analyzer

205 Activation information analyzer

206 DFI analyzer

209 Transmission data generator

1-9. (canceled)
 10. A terminal, comprising: reception circuitry, which,in operation, receives feedback information from a base station on a UEspecific physical downlink control channel (PDCCH), the feedbackinformation including a response signal for uplink data; andtransmission circuitry, which, in operation, performs a retransmissionbased on the feedback information and configured grant configurationinformation; wherein the feedback information indicates HARQ-ACKinformation for each HARQ process by using a bitmap.
 11. The terminalaccording to claim 10, wherein the feedback information includes a firstHARQ-ACK information of a first configured grant transmission and asecond HARQ-ACK information of a second configured grant transmission,the first configured grant transmission is configured by a higher layersignaling, and the second configured grant transmission is configured byactivation downlink control information (DCI) after a reception of thehigher layer signaling.
 12. The terminal according to claim 11, whereinthe UE specific PDCCH is scrambled with a Radio Network TemporaryIdentifier (RNTI) corresponding to both of the first configured granttransmission and the second configured grant transmission.
 13. Theterminal according to claim 11, wherein the UE specific PDCCH includesan identification bit associated with the first configured granttransmission and the second configured grant transmission.
 14. Theterminal according to claim 10, wherein each bit of the bitmap indicatesACK or NACK for one HARQ process, respectively.
 15. The terminalaccording to claim 10, wherein assignment information of the feedbackinformation is indicated by the UE specific PDCCH.
 16. A communicationmethod comprising: receiving feedback information from a base station ona user equipment (UE) specific physical downlink control channel(PDCCH), the feedback information including a response signal for uplinkdata; and performing a retransmission based on the feedback informationand configured grant configuration information; wherein the feedbackinformation indicates HARQ-ACK information for each HARQ process byusing a bitmap.
 17. The communication method according to claim 16,wherein the feedback information includes a first HARQ-ACK informationof a first configured grant transmission and a second HARQ-ACKinformation of a second configured grant transmission, the firstconfigured grant transmission is configured by a higher layer signaling,and the second configured grant transmission is configured by activationdownlink control information (DCI) after a reception of the higher layersignaling.
 18. The communication method according to claim 17, whereinthe UE specific PDCCH is scrambled by using a Radio Network TemporaryIdentifier (RNTI) corresponding to both of the first configured granttransmission and the second configured grant transmission.
 19. Thecommunication method according to claim 17, wherein the UE specificPDCCH includes an identification bit associated with the firstconfigured grant transmission and the second configured granttransmission.
 20. The communication method according to claim 16,wherein each bit of the bitmap indicates ACK or NACK for one HARQprocess, respectively.
 21. The communication method according to claim16, wherein assignment information of the feedback information isindicated by the UE specific PDCCH.